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PayPal online payment interface application starts from scratch, section 2nd, [payment API principles and procedures]

Source: Internet
Author: User
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Today, let's take a look at the Paypal payment process and simple authentication principles. I have drawn a picture to express these two points.
Our site name, for better understanding, is now set as the site of Xi Hu.


Click here to view the clear source Image
Well, the theoretical knowledge is very important. I have understood this figure first. Next we will use sandbox testing for programming.
For more information, see the API documentation provided by PayPal:
Click here to view the API documentation

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